The Size #10 is also titled Jr. Whopper Popper measures 11/16" diameter. It is also referred to as a 7. The Size #4 measures 5/8" diameter. The Size #3 measures 1/2" diameter. All three styles are available in Black and Nickel and sold by the gross (144 pieces) sets. The measuring ribbon represents an approximation. If you are interested in purchasing just one side of a snaps, please contact customer service.